Electrically-controlled dumb-waiter



Sept. 4, 1928- 1,683,391 J. G. MALAREN ELECTRICALLY CONTROLLED DUMB WAITER Filed July 5, 1924 Patented, Sept. 4, 1928.

UNITED i "srafi i552- A F TE Ni oF FIC E} l JAMES Ci. MAoILARnn, or MaMAnoNnoK, NEW YORK. I

ELECTRICALLY-CONTROLLED DUM -Warren,

- 1 Application nann 5,

This invention relates generally: to im; provements in dumb-waiters of the cally controlled type. I

In the operation of electrically controlled dumb-waiters as heretofore known and used considerable diflicultyhas been found in. pres.

venting the carfrom responding to the .con-

trol exercised byfa'closed. circuit controller at a distant station and leaving-the station l at whichit has come' to rest before-the at tendant hashad an opportunity to opeirthe hatchway door. It is a common practicein; the art to provide a safety switch mechanism to prevent the operation of the car while any door is open but no provision has heretofore been made to prevent the starting of the car immediately after it has come to rest and before the hatchway door has been opened.

The present invention includes means providing forthe elapse of a predetermined in terval of time following. the stopping'ofthe' car before it can be a ain started bv the dos l I Y n c c 7 mg of a control (311011111 at a CllSbEUllY point This delay, or pause of the carat a stationls current flowing through either the starting circuit or through the mainline motor switch circuit. The circuit controller is arranged to interrupt the starting circuit as the main line circuit is closed and to maintain the interrup tion in the starting circuit until the main line circuit has been opened and the car has come to rest. Upon cessation of the flow of current in the main line circuit the controller is arranged to provide a retarded or delayed circuit closing action so that the starting circuit cannot be utilized until after the lapse of a period of time following the stopping of the car at a station.

In the drawings, in which a preferred form of the invention has been selected for illustration,

Figure 1 is a view in diagrammatic form of an embodiment of the'invention and the wiring arrangement employed therewith.

motor-starting circuit which is operated by 1924i Serial No. 724,544.

' j;Figure 2 is a sectional view on an enlarged scale of a magnetically operated circuit conf trollerrormmg part ofthe lnvention.

Figure 3 is a view in side elevation of the circuit controlling device shown in Figure 2. 3 Rei'err1ng to the'drawings for a more detailed description of the invention, at-5 and '6 are shown the terminals of a current feed.

or supply circuit from which current may be supplied to either the up coil 7 or to the down coil '8 of a main switch operating magnet or relay 9.

down push buttons by which a starting circuit may be closed to actuate the corresponding up or down coils 7 or 8 ofthe main relay 9, The starting circuit for the up coil and push button may betraced as followsz'feed wire terminals 5, .conductorl2, conductor 13,

contact 14, bridgecontact member 15, contact 16, conductor 17, branch conductor 18, push button contact 10, conductor 20, up coil '7 of relay 9;and conductor 21 including coil 22 back toterminal 6. Acorrespondingstarting circuitfor the downcoil-and push button as follows: terminal 5, conductors 12.1317 as before, down. push button contact 11, conductor 24, down coil 8 of relay 9,

and common return conductor 21 to feedterminal 6.

At-10 and 11. is represented aset of up and A supplemental control of the starting circuits referred tois provided by the bridge contact 15' in its relation to a gap 25 between the contact terminalsof-the conductors 13 and 17 Toeffect this the coil or solenoid 22 is provided with a plunger armature 26 carrying at its lower end the bridge contact member 15 and at its upper extremity termi nating in a piston 27 adapted to rise readily in thecylinder 28 but to move slowly'downward therein. By this construction it will be seen that the flow of current which energizes either one of the relay coils 7 or 8 at the same time energizes coil 22 and lifts the contact member 15 out'of bridging relation with the contacts 14 and 16, thereby producing a gap in the starting circuit. 1

It will be seen that the relay 9 is of the holding or stick type in that the energize.- tion of either coil 7 or 8 lifts a corresponding armature 29 or 30 into engagement with sets of contacts 31 or 32 in a branch conductor 33 which serves to shunt out the push button circuit closers and maintain the coil circuit closed until interrupted by a suitable car stopping deviceynot shown. The armatures 29 and 30 are conveniently connected-to a reversing switch, not shown, for controlling the duration of rotation of .the motor. It will be seen that once the coil 22 has been en'- ergized the contact member 15 is lifted and a starting circuit cannot again beclosed until the flow of current through the main control switch relay has ceased. V g t It has been stated that the piston 27 moves upwardly readily butv moves downwardly slowly. To achieve this the piston is pro-.v vided with an inverted leather cup-shaped disk or member 34 and the cylinder 28 is provided with an air inlet port'35 controlled by an adjustable needle valve screw 36 by which the time interval required for the descent of the piston and the'closing of the gap- 25-inthe starting circuit can'be adjusted as desired."

It will be seen that with the construction described a time interval can be provided following the timewhen a car stops at a station and before the motor canagain be started to afford an opportunity ior the attendant to open the hatchway door. VVh at is claimed is i 1. In electrical controllingmeans for dumb-waiters, a startingcireuit, a main car operating circuit, and a solenoid including a piston havingrestricted movement in one d1- rection and responsive to the condition of the caroperatlng circuitand controlling the car' starting circuit for preventing-the actuation of the car moving'means for a predetermined interval of time following the stopping of the car at a station.

2.1n electrical controlling means for "dumb-waiters, a starting-circuit, a main car control circuit, a circuit controller arranged to open 'or'close a gap in the starting circuit, said circuit controller arranged to be set into operation to open the gap when current flows through the main circuit, said controller operating to automatically close the gap in the startingcircuit upon cessation of the flow of current in the main circuit, and means for 1 retarding the gap-closing action of the controller to provide a time interval between the stopping of the controller to provide a time interval between the stopping of the car at a station and itssubsequent starting.

- 3.tIn electrical controlling means for dumb-Waiters, a starting circuit, a inafin car the flow of current in the main control circuit, said controller operating to automatically close the gap in the starting'circuit upon cessation-of the flow of current in the main circuit, and adjustable means for-res tardingthe gap-closing operation of the con:

troller to provide a time interval following the stopping of a car at a station, before the car can be again started.

JAMES e. MAGLAREN. 

